moved ipc_init above config file processing.

This is necessary because commands in the config file (mode for
instance) emit ipc events, and if ipc_init has not been called the
ipc_clients_list is not initialized, and we segfault.  This fixes that
bug.

sway/main.c

@@ -213,6 +213,8 @@ int main(int argc, char **argv) {
 
 	init_layout();
 
+	ipc_init();
+
 	if (validate) {
 		bool valid = load_main_config(config_path, false);
 		return valid ? 0 : 1;
@@ -226,8 +228,6 @@ int main(int argc, char **argv) {
 		free(config_path);
 	}
 
-	ipc_init();
-
 	if (!terminate_request) {
 		wlc_run();
 	}